Add brown sugar, soy sauce (3), mirin, and sesame oil to a saucepan and cook until it bubbles. Set aside and allow to cool.
Add butter to a sauté pan with mushrooms. Sauté for a few minutes until they start to get a little bit of color then add soy sauce. Sauté for another minute and set aside.
Thinly slice shallots crosswise into rings. Place shallots in a medium saucepan with oil. Set over medium-low heat and cook, stirring often, until shallots are golden brown, about 10 minutes. Add shallots to a paper-lined plate to drain excess oil. Sprinkle with salt.
Add oil to a pan with slices of spam, and cook until seared. Add in a soy glaze and cook for about 1 minute. Remove from heat and set aside.
Mince garlic and ginger and add to a medium pot with oil. Cook until it begins to crisp. Add chicken stock at medium heat until it begins to boil. Add rolled oats, soy sauce (1), garlic powder, salt, and gochujang.
Allow it to return to a boil, then reduce the heat to medium-low. Let the oats simmer for about 5 minutes, or until thickened.
While simmering, chop green onions and fry an egg to your liking. Remove oats from heat and top with soy-glazed spam, crispy fried shallots, sauteéd mushrooms, egg, and green onions. Taste and add salt to your liking, and top with chili oil.